// Vulkan API服务实现 - 仅使用safe Rust

#![forbid(unsafe_code)]

use std::sync::Arc;
use std::sync::Mutex;
use std::collections::HashMap;
use std::vec::Vec;
use log::{info, warn, error};

// 导入能力类型和错误类型
use super::{Capability, CapabilityId};
use super::gfx_service::{GraphicsService, GraphicsError};

// Vulkan对象ID类型
pub type VkInstance = u64;
pub type VkPhysicalDevice = u64;
pub type VkDevice = u64;
pub type VkQueue = u64;
pub type VkCommandPool = u64;
pub type VkCommandBuffer = u64;
pub type VkBuffer = u64;
pub type VkImage = u64;
pub type VkImageView = u64;
pub type VkSwapchainKHR = u64;
pub type VkSemaphore = u64;

// Vulkan错误类型
#[derive(Debug, Clone, PartialEq)]
pub enum VulkanError {
    InitializationFailed,
    DeviceNotFound,
    MemoryAllocationFailed,
    InvalidHandle,
    GraphicsError(GraphicsError),
    FeatureNotSupported,
}

// Vulkan实例描述
pub struct VkInstanceDesc {
    pub application_name: String,
    pub application_version: u32,
    pub engine_name: String,
    pub engine_version: u32,
    pub api_version: u32,
}

// Vulkan设备队列描述
pub struct VkDeviceQueueCreateInfo {
    pub queue_family_index: u32,
    pub queue_priorities: Vec<f32>,
}

// Vulkan缓冲区描述
pub struct VkBufferCreateInfo {
    pub size: u64,
    pub usage: u32,
}

// Vulkan内存分配信息
pub struct VkMemoryAllocateInfo {
    pub allocation_size: u64,
    pub memory_type_index: u32,
}

// Vulkan服务
pub struct VulkanService {
    graphics_service: Arc<Mutex<GraphicsService>>,
    instances: HashMap<VkInstance, VulkanInstance>,
    physical_devices: HashMap<VkPhysicalDevice, VulkanPhysicalDevice>,
    logical_devices: HashMap<VkDevice, VulkanLogicalDevice>,
    next_instance_id: VkInstance,
    next_physical_device_id: VkPhysicalDevice,
    next_logical_device_id: VkDevice,
    mem_cap: Capability,
}

// Vulkan实例
pub struct VulkanInstance {
    id: VkInstance,
    desc: VkInstanceDesc,
}

// Vulkan物理设备
pub struct VulkanPhysicalDevice {
    id: VkPhysicalDevice,
    instance_id: VkInstance,
    device_name: String,
    memory_properties: VkPhysicalDeviceMemoryProperties,
    queue_family_properties: Vec<VkQueueFamilyProperties>,
}

// Vulkan逻辑设备
pub struct VulkanLogicalDevice {
    id: VkDevice,
    physical_device_id: VkPhysicalDevice,
    queues: HashMap<VkQueue, VulkanQueue>,
    command_pools: HashMap<VkCommandPool, VulkanCommandPool>,
    buffers: HashMap<VkBuffer, VulkanBuffer>,
    images: HashMap<VkImage, VulkanImage>,
    image_views: HashMap<VkImageView, VulkanImageView>,
    swapchains: HashMap<VkSwapchainKHR, VulkanSwapchain>,
    semaphores: HashMap<VkSemaphore, VulkanSemaphore>,
    next_queue_id: VkQueue,
    next_command_pool_id: VkCommandPool,
    next_buffer_id: VkBuffer,
    next_image_id: VkImage,
    next_image_view_id: VkImageView,
    next_swapchain_id: VkSwapchainKHR,
    next_semaphore_id: VkSemaphore,
}

// Vulkan队列
pub struct VulkanQueue {
    id: VkQueue,
    queue_family_index: u32,
    queue_index: u32,
}

// Vulkan命令池
pub struct VulkanCommandPool {
    id: VkCommandPool,
    queue_family_index: u32,
}

// Vulkan缓冲区
pub struct VulkanBuffer {
    id: VkBuffer,
    size: u64,
    usage: u32,
    memory_id: u64, // 对应GraphicsService中的GPU资源ID
}

// Vulkan图像
pub struct VulkanImage {
    id: VkImage,
    width: u32,
    height: u32,
    format: u32,
    usage: u32,
    memory_id: u64, // 对应GraphicsService中的GPU资源ID
}

// Vulkan图像视图
pub struct VulkanImageView {
    id: VkImageView,
    image_id: VkImage,
    view_type: u32,
    format: u32,
}

// Vulkan交换链
pub struct VulkanSwapchain {
    id: VkSwapchainKHR,
    device_id: VkDevice,
    image_count: u32,
    images: Vec<VkImage>,
    image_views: Vec<VkImageView>,
}

// Vulkan信号量
pub struct VulkanSemaphore {
    id: VkSemaphore,
}

// Vulkan物理设备内存属性
pub struct VkPhysicalDeviceMemoryProperties {
    memory_types: Vec<VkMemoryType>,
    memory_heaps: Vec<VkMemoryHeap>,
}

// Vulkan内存类型
pub struct VkMemoryType {
    property_flags: u32,
    heap_index: u32,
}

// Vulkan内存堆
pub struct VkMemoryHeap {
    size: u64,
    flags: u32,
}

// Vulkan队列族属性
pub struct VkQueueFamilyProperties {
    queue_flags: u32,
    queue_count: u32,
    timestamp_valid_bits: u32,
    min_image_transfer_granularity: VkExtent3D,
}

// Vulkan三维尺寸
pub struct VkExtent3D {
    width: u32,
    height: u32,
    depth: u32,
}

impl VulkanService {
    // 创建新的Vulkan服务
    pub fn new(graphics_service: Arc<Mutex<GraphicsService>>, mem_cap: Capability) -> Result<Self, String> {
        Ok(VulkanService {
            graphics_service,
            instances: HashMap::new(),
            physical_devices: HashMap::new(),
            logical_devices: HashMap::new(),
            next_instance_id: 1,
            next_physical_device_id: 1,
            next_logical_device_id: 1,
            mem_cap,
        })
    }

    // 启动Vulkan服务
    pub fn start(&mut self) -> Result<(), String> {
        info!("Vulkan service started successfully");
        Ok(())
    }

    // 创建Vulkan实例
    pub fn create_instance(&mut self, desc: VkInstanceDesc) -> Result<VkInstance, VulkanError> {
        let instance_id = self.next_instance_id;
        self.next_instance_id += 1;

        let instance = VulkanInstance {
            id: instance_id,
            desc: desc.clone(),
        };

        self.instances.insert(instance_id, instance);

        info!("Created Vulkan instance: {}, app={}", 
              instance_id, desc.application_name);

        Ok(instance_id)
    }

    // 销毁Vulkan实例
    pub fn destroy_instance(&mut self, instance_id: VkInstance) -> Result<(), VulkanError> {
        if let Some(_instance) = self.instances.remove(&instance_id) {
            // 销毁与该实例关联的所有物理设备
            let physical_devices_to_remove: Vec<VkPhysicalDevice> = self.physical_devices
                .iter()
                .filter(|(_, pd)| pd.instance_id == instance_id)
                .map(|(id, _)| *id)
                .collect();

            for pd_id in physical_devices_to_remove {
                self.destroy_physical_device(pd_id)?;
            }

            info!("Destroyed Vulkan instance: {}", instance_id);
            Ok(())
        } else {
            Err(VulkanError::InvalidHandle)
        }
    }

    // 枚举物理设备
    pub fn enumerate_physical_devices(&mut self, instance_id: VkInstance) -> Result<Vec<VkPhysicalDevice>, VulkanError> {
        if !self.instances.contains_key(&instance_id) {
            return Err(VulkanError::InvalidHandle);
        }

        // 创建一个模拟的物理设备（在实际实现中应该枚举真实的GPU）
        let physical_device_id = self.next_physical_device_id;
        self.next_physical_device_id += 1;

        // 创建模拟的物理设备属性
        let memory_type = VkMemoryType {
            property_flags: 0x01, // HOST_VISIBLE
            heap_index: 0,
        };

        let memory_heap = VkMemoryHeap {
            size: 1024 * 1024 * 1024, // 1GB
            flags: 0,
        };

        let memory_properties = VkPhysicalDeviceMemoryProperties {
            memory_types: vec![memory_type],
            memory_heaps: vec![memory_heap],
        };

        let queue_family_property = VkQueueFamilyProperties {
            queue_flags: 0x01, // GRAPHICS_BIT
            queue_count: 1,
            timestamp_valid_bits: 64,
            min_image_transfer_granularity: VkExtent3D {
                width: 1,
                height: 1,
                depth: 1,
            },
        };

        let physical_device = VulkanPhysicalDevice {
            id: physical_device_id,
            instance_id: instance_id,
            device_name: "Mock GPU Device".to_string(),
            memory_properties: memory_properties,
            queue_family_properties: vec![queue_family_property],
        };

        self.physical_devices.insert(physical_device_id, physical_device);

        Ok(vec![physical_device_id])
    }

    // 销毁物理设备
    pub fn destroy_physical_device(&mut self, physical_device_id: VkPhysicalDevice) -> Result<(), VulkanError> {
        if let Some(_physical_device) = self.physical_devices.remove(&physical_device_id) {
            // 销毁与该物理设备关联的所有逻辑设备
            let logical_devices_to_remove: Vec<VkDevice> = self.logical_devices
                .iter()
                .filter(|(_, ld)| ld.physical_device_id == physical_device_id)
                .map(|(id, _)| *id)
                .collect();

            for ld_id in logical_devices_to_remove {
                self.destroy_device(ld_id)?;
            }

            info!("Destroyed Vulkan physical device: {}", physical_device_id);
            Ok(())
        } else {
            Err(VulkanError::InvalidHandle)
        }
    }

    // 创建逻辑设备
    pub fn create_device(
        &mut self,
        physical_device_id: VkPhysicalDevice,
        queue_create_infos: Vec<VkDeviceQueueCreateInfo>
    ) -> Result<VkDevice, VulkanError> {
        if !self.physical_devices.contains_key(&physical_device_id) {
            return Err(VulkanError::InvalidHandle);
        }

        let device_id = self.next_logical_device_id;
        self.next_logical_device_id += 1;

        let logical_device = VulkanLogicalDevice {
            id: device_id,
            physical_device_id: physical_device_id,
            queues: HashMap::new(),
            command_pools: HashMap::new(),
            buffers: HashMap::new(),
            images: HashMap::new(),
            image_views: HashMap::new(),
            swapchains: HashMap::new(),
            semaphores: HashMap::new(),
            next_queue_id: 1,
            next_command_pool_id: 1,
            next_buffer_id: 1,
            next_image_id: 1,
            next_image_view_id: 1,
            next_swapchain_id: 1,
            next_semaphore_id: 1,
        };

        self.logical_devices.insert(device_id, logical_device);

        // 创建队列
        for (_index, queue_info) in queue_create_infos.iter().enumerate() {
            for i in 0..queue_info.queue_priorities.len() {
                let queue_id = self.logical_devices.get_mut(&device_id).unwrap().next_queue_id;
                self.logical_devices.get_mut(&device_id).unwrap().next_queue_id += 1;

                let queue = VulkanQueue {
                    id: queue_id,
                    queue_family_index: queue_info.queue_family_index,
                    queue_index: i as u32,
                };

                self.logical_devices.get_mut(&device_id).unwrap().queues.insert(queue_id, queue);
            }
        }

        info!("Created Vulkan logical device: {}", device_id);

        Ok(device_id)
    }

    // 销毁逻辑设备
    pub fn destroy_device(&mut self, device_id: VkDevice) -> Result<(), VulkanError> {
        if let Some(_device) = self.logical_devices.remove(&device_id) {
            info!("Destroyed Vulkan logical device: {}", device_id);
            Ok(())
        } else {
            Err(VulkanError::InvalidHandle)
        }
    }

    // 创建缓冲区
    pub fn create_buffer(&mut self, device_id: VkDevice, create_info: VkBufferCreateInfo) -> Result<VkBuffer, VulkanError> {
        if let Some(device) = self.logical_devices.get_mut(&device_id) {
            let buffer_id = device.next_buffer_id;
            device.next_buffer_id += 1;

            // 通过图形服务创建GPU缓冲区
            let graphics_service = self.graphics_service.lock().map_err(|_| {
                VulkanError::InitializationFailed
            })?;

            let gpu_buffer_id = graphics_service.create_buffer(create_info.size, create_info.usage)
                .map_err(VulkanError::GraphicsError)?;

            let buffer = VulkanBuffer {
                id: buffer_id,
                size: create_info.size,
                usage: create_info.usage,
                memory_id: gpu_buffer_id,
            };

            device.buffers.insert(buffer_id, buffer);

            Ok(buffer_id)
        } else {
            Err(VulkanError::InvalidHandle)
        }
    }

    // 销毁缓冲区
    pub fn destroy_buffer(&mut self, device_id: VkDevice, buffer_id: VkBuffer) -> Result<(), VulkanError> {
        if let Some(device) = self.logical_devices.get_mut(&device_id) {
            if let Some(buffer) = device.buffers.remove(&buffer_id) {
                // 通过图形服务释放GPU缓冲区
                let graphics_service = self.graphics_service.lock().map_err(|_| {
                    VulkanError::InitializationFailed
                })?;

                graphics_service.free_resource(buffer.memory_id)
                    .map_err(VulkanError::GraphicsError)?;

                Ok(())
            } else {
                Err(VulkanError::InvalidHandle)
            }
        } else {
            Err(VulkanError::InvalidHandle)
        }
    }

    // 创建命令池
    pub fn create_command_pool(
        &mut self,
        device_id: VkDevice,
        queue_family_index: u32
    ) -> Result<VkCommandPool, VulkanError> {
        if let Some(device) = self.logical_devices.get_mut(&device_id) {
            let command_pool_id = device.next_command_pool_id;
            device.next_command_pool_id += 1;

            let command_pool = VulkanCommandPool {
                id: command_pool_id,
                queue_family_index: queue_family_index,
            };

            device.command_pools.insert(command_pool_id, command_pool);

            Ok(command_pool_id)
        } else {
            Err(VulkanError::InvalidHandle)
        }
    }

    // 销毁命令池
    pub fn destroy_command_pool(&mut self, device_id: VkDevice, command_pool_id: VkCommandPool) -> Result<(), VulkanError> {
        if let Some(device) = self.logical_devices.get_mut(&device_id) {
            if device.command_pools.remove(&command_pool_id).is_some() {
                Ok(())
            } else {
                Err(VulkanError::InvalidHandle)
            }
        } else {
            Err(VulkanError::InvalidHandle)
        }
    }

    // 分配内存
    pub fn allocate_memory(
        &mut self,
        _device_id: VkDevice,
        allocate_info: VkMemoryAllocateInfo
    ) -> Result<u64, VulkanError> {
        // 在这个简化实现中，我们直接返回一个模拟的内存ID
        // 在实际实现中，这应该调用图形服务分配内存
        Ok(allocate_info.allocation_size)
    }

    // 绑定缓冲区内存
    pub fn bind_buffer_memory(
        &mut self,
        device_id: VkDevice,
        buffer_id: VkBuffer,
        _memory_id: u64,
        _memory_offset: u64
    ) -> Result<(), VulkanError> {
        // 在这个简化实现中，我们只是验证参数
        if let Some(device) = self.logical_devices.get(&device_id) {
            if device.buffers.contains_key(&buffer_id) {
                Ok(())
            } else {
                Err(VulkanError::InvalidHandle)
            }
        } else {
            Err(VulkanError::InvalidHandle)
        }
    }

    // 停止Vulkan服务
    pub fn stop(&mut self) -> Result<(), String> {
        // 清理所有资源
        let instance_ids: Vec<VkInstance> = self.instances.keys().cloned().collect();
        for instance_id in instance_ids {
            let _ = self.destroy_instance(instance_id);
        }

        info!("Vulkan service stopped successfully");
        Ok(())
    }
}

impl Drop for VulkanService {
    fn drop(&mut self) {
        let _ = self.stop();
    }
}